Safety device for elevators



June 5, 1928.; 1,672,175

J. G. RUSSELL SAFETY DEVICE FOR ELEVATORS Filed April 26, 1927 2 Sheets-Sheet l 4 [3 2 3 n 9' 3'4. Z8 7 r M I f :E o

Inventor June 5. 1928.

J. G. RUSSELL SAFETY DEVICE FOR ELEVATORS Filed April 26, 1927 2 Sheets-Sheet 2 upper Patented June 5 1928.

UNITED STATES PATENT OFFICE.

SAFETY DEVICE FOR ELEVATORS.

Application filed April 26,

This invention relates to newand useful improvements in elevator safety devices and aims to provide a relatively novel, simple and useful mechanism for association with elevators and their guide shafts, so as to facilitate the mechanical stoppage of the elevator should the same drop within the shaft, due to the breakage of the elevating and lowering cables or the slippage of the same upon their operating pulleys.

An important object of the invention is to provide a safety device of this character, that may be installed within elevators and their guide shafts without requiring any change in the structure of the elerator or shaft, and without interfering with the elevator mechanism.

With the foregoing and other objects in view the invention consists in the novel for:

mation and arrangement of parts as will be hereinafter described.

In the drawings, wherein for the purpose of illustration is shown the preferred embodiment of my invention: l

Figure 1 is a fragmentary vertical section through an elevator and its guide shaft with a safety device equipment in accordance with the present invention.

Figure 2 is a detail horizontal section, taken substantially on the line 22 of Figure 1, and looking downwardly in the direction of the arrows.

Figure is a fragmentary horizontal section taken substantially on the line of Figure 1, but disclosing the means for securing the safety device operating lever in applied position.

Figure 4: is an enlarged View disclosing the end of one of the brake beams in elevation, and its particular brake shoe in longitudinal cross section, and

Figure 5 is anoutside elevation of one of the brake beams per so.

Now having particular reference to the drawings, 5 designates generally'a conventional elevator movable vertically within the usual shaft.

In carrying out my invention, there is arranged vertically within the shaft at the four corners thereof, vertically extending brake shoe engaging bars, 6, four of these bars being arrangedat each corner, andin spaced pairs as clearly disclosed in Figure 2. Arranged upon the under side of the flooring of the elevator 5 at opposite sides thereof are spaced parallel frame boards 77,

conventional 1927-. SeriaINo. 186,718.

connected by a predetermined number of spaced cross members 8. Arranged between two of these cross members at the front side ofthe elevator 5, are spaced parallel straps 9.9, through which, as well as the frame boards 7-7 are arranged the opposite. ends of the rocker shaft 10. Connected to this shaft 10 between the straps 9-9 of the frame boards 7-7 at the opcrators side of the elevator 5 isthe lower end of a relatively elongated throw lever 11, that extends upwardly through a slot 12 in the elevator flooring, as clearly disclosed in Figure 1. Connected to this lever 11 above and below the rocker shaft 10 are forwardlyand rearwardly extending links 12 and 13, the lower link being pivotally connected at its inner end to a rear-wardly extending bar 14, guided through large openings in the cross members 8 between the frame boards 7 -7 at that particular side of the elevator. The forward link 12 is pivotally connected at its free end to a short sectional bar 15, that pro jects forwardly ofthe elevator as clearly indicated in Figures 1 and "2.

Connected to the rock shaft'l'O at the op-I posite'sideof the elevator is a rocker arm 17 ,the upper and lowerends of which are pivotally secured'to links identical to the links 12 and 13 just described and therefore these links will also be' designated by the same reference characters and pivoted to the outer ends thereof are bars similar to the bars 1st and 15 just describechat the opposite side of the elevator and therefore said bars will also be designated liand 15, as in.

Figure 1. I

The safety device further consists of four identically constructed brace beams for pivotal attachment to. the outer ends of the four bars 14' and 15st opposite sides of the elevator shaft.

beam 18 is pivoted, at its center to a: horizontal arm 19 extending outwardly from the adjacent side wall of the elevator 5, so as to permit the same to be rocked thereon. The upper end of each beam 18 is formed at its inner edge with an arcuate slot 20,

Insomuch as the construction I of each brace beam together with its assowhile pivoted to each beam as at 21 is the inner bifurcated end 22 of a brake head 23, that extends outwardly from the elevator as clearly disclosed in Figure 1. The forward end of each head is provided with a plate,

while attached thereto is a facing of braking material 24. Extending through the bifurcated end 22 of each brake head 23 as well as the arcuate shaped slot 20 of its particular beam 18 is a guide pin 25, the particular connection between each head and beam allowing the head to pivot thereon so that the same may engage in a flush manner with the outermost bars 6, at each corner of the elevator shaft.

Connected to the ends of the rocker shaft operated bars 14; and 15 between the innermost bars 6 at the four corners of the shaft and the lower end of the brake beams 18 are brake shoes 26, each of which is provided at its inner face with a strip of braking matcrial 27 for engaging the innermost bars 6 at the corners of the elevator shaft.

Obviously when the lever 11 is in the poneon disclosed in Figure 1, the various brake beams 18 are so swung upon their pivots as to cause the brake members at the upper and lower ends thereof to engage the inner and outer pairs of bars 6 at the corners of the elevator shaft, so as to prevent the movement of the elevator or to permit the same to slowly descend.

WVithin the elevator 5 is a horizontally arranged segmental arm 28, formed throughout substantially its entire length with a slot 29, one edge of which is formed With ratchet teeth 30 and through which slot projects the lever 11, this construction being provided, in order that the lever may be ratcheted over the teeth 30 and caught back of any predetermined run thereof, so that the same may be latched in operative position. In order that a further pull upon the lever 11 may be occasioned after being drawn backwardly as far as possible by the operator pulling directly thereon there is provided a turn buckle arrangement 31 consist ing of a pair of rods 3232 connected at their inner ends by a hand wheel turn buckle 33, the innermost rod 32 being pivoted to the side of the elevator and the opposite end thereof being provided with a suitable hook 3 1 for engagement over the lever 11, as indicated in Figure 3. Obviously, when this turn buckle, arrangement is engaged at its free end with the lever 11 and the hand wheel 33 turned in the proper direction, the lever 11 will be further drawn rearwardly so as to cause the engagement of the brake shoes with the pairs of bars 6, to absolutely prevent any dropping of the elevator. It will thus be seen that I have provided a highly novel, simple and eliicient safety device for elevators that is well adapted for all of the purposes heretofore designated, even though I have herein shown and described the invention as consisting of certain detail elements, it is nevertheless to be understood that some changes may be made therein without departing from the spirit of the invention or the scope of the appended claims.

Having thus described my invention, what is claimed i1: 1

1. In a safety stop for elevators, spaced vertically extending brake bars at the corners of the elevator shaft, a pair of units suspended from the floor of the elevator cage, each unit being arranged between the brake bars at opposed corners of the shaft, each unit including a forwardly and rear wardly extending bar, a brake beam pivoted to the outer end of each bar and arranged between the spaced brake bars at that particular corner of the shaft, a pivotal connection between each beam and the elevator cage, brake shoes at the ends of each beam for engagement with the opposed faces of the spaced brake bars andrmeans common to the bars of each unit extending into the cage whereby the said beam bars may be operated to so swing the shoes as to engagethe brake shoes with said'brake bars. I

2. In a safety stop for elevators, spaced vertically extending brake bars at the cor- 11ers of the elevator shaft, a pair of units suspended from the floor of the elevator cage, each unit including brake beams at the opposite ends thereof spaced brake bars at two aligned corners of the shaft, brake shoes upon'the ends of the beams, and single means within the elevator cage, whereby all of the beai'ns may swung as to cause the engagement of the shoes with the opposed faces of said spaced brake bars.

3. In a safety stop for elevators, spaced vertically extending brake bars at the corners of the elevator shaft, a pair of units suspended from the floor of the elevator cage, each unit being arranged between the bralcc bars at opposed corners of the shaft, each arranged between the be so unit including forwardly and rearwardly ex tending bars, a brake beam pivoted to the outer end of each bar and arranged between the spaced brake bars at their corner of the shaft, a pivotal connection between each beam and the elevator cage, a pivotal brake shoe at the upper end of each brake beam for engaging certain of the brake bars at the respective corners of the elevator shaft, andv means common to said beam bars and extending into the elevator cage, whereby the beam bars may be operated to so swing the beams as to engage the brake shoes with said brake bars. i

In testimony whereof I my signature. 

